In this paper, shop time is taken up in a basic research of manufacturing lead time estimation. Shop time consists of set-up time, processing time, queue time, and others. Among these elements, the queue time cannot be estimated so easily ad others. The purpose of this paper is to propose an estimation method of queue time. In the previous paper, an estimate equation of mean queue time, based mainly on the results of queuing theory, is proposed. In this paper, numerical calculation has been conducted, and new estimate equation is made based on the results. Furthemore, an estimate equation of the standard deviation of queue time is also proposed.
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